Core-oven.



' P.-:B. HARRISON.

GORE OVEN.

APPLIGATION FILED'JUNE 28,191.

Patented Dec. 15,1914.

4 SHEETS-SHEET 3.

W cmsse/a I 711162123 ipB arrwo P. B. HARRISON.

COBB OVEN.

Amman-10x nLnn Jun 2a. 1913.

UNITED STATES PATENT OFFICE.

PHILIP B. HARRISON, OF CHICAGO, ILLINOIS, .ASSIGNOR T CHICAGO RAILWAYEQUIP- MENT COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CORE-OVEN.

same, reference being had to the accompanying drawings, forming part ofthis specification, in which Figure 1 isa diagrammatic side elevationalView of my improved core oven. Fig.

2 is an enlarged vertical sectional view through the same. Fig. 3 is aplan view of one of the sections. Fig. 4 is a front elevational viewshowing the front casing removed.

This invention relates to a new anduseful improvement in core ovens, theobject being to construct a device of the character described which issimple, cheap and efficient.v

Heretofore,'in the production of cores for castings it has usually beenthe practice to bake the cores in a chamber where they will comeindirect contact with the products of combustion. The result is that vthe cores are not uniformly baked and it frequently happens that thesurfaces in direct contact with the flames will be overbaked and becomebrittle so that corners will be broken in handling. By the use of myconstruction wherein steam is employed as the heating medium and thesteam pipes constitute the shelves or supports on which the trayscontaining the coresrest, I am enabled to uniformly bake the coresthroughout their entire masses respectively getting rid of moisture, thecores being baked to the desired degree so that they are tough and canbe handled without fear of breakage.

In practice, I prefer to use steam at about 100 pounds pressure, whichwill give a heat in the oven of about 210 or 215 degrees, sufficient toevaporate all moisture in the cores and bake them thoroughly. The coresare left in the oven for from 3 to 4: hours, or

0 such time as practice shows to be best suited for the. particularcomposition of the cores being baked. Y

In the drawings, I have shown my im proved core oven arranged as abattery, al-

though it is obvious that any other arrange- Specification of LettersPatent. Patent d D 1-5 1914. Application filed June 28, 1913. Serial No.776,429. I

ment best suited to local conditions can be resorted to. I a

1 indicates a brick back wall, which may be the wall of a building,against the lower portion of .which. is'arranged a channel 2.

3-is the front channel preferably parallel to the channel 2 and beingprovided with openmgs for the passage of suitable exhaust pipeshereinafter referred to. Channel 3 is also provided with ventilatingopenings 4 (see Fig. 4) which are controlled by suitable plugs or doors,not shown. Resting upon the channels 2 and 3 are upright angles 5, thefront posts or angles being arranged in short sections and connected toa belt rail or angle 6.

7 are top angles to which the upper ends of the posts 5 are connected,said top angles in turn being connected to the buck staves 8 betweenwhich are secured the partition Walls 9. A brick arch 10 is supportedupon the top angles 7 and suitable doors, not shown, close the openingsin the front wall of the oven. Preferably there are upper and lowerdoors, 'but, of course, a single door may beemployed throughout theentire height of the oven.

The steam .for the battery of ovens is taken from a header 11 andconnected by a valved connection to a stand pipe 12. Midway from thisstand pipe leads. a pipe 13 for supplying steam to the first series ofcoils 14 constituting the upper shelf or sup- ,port for the core trays.This upper shelf is connected by a vertical pipe 15 to the coils 16 ofthe second shelf and so on down to the lower series of coils. 17 of theupper compartment,which latter is in turn connected by an exhaust pipe18 to carry off the water of condensation to the discharge pipe 20, thepipe 18 extending outwardly through an opening in the channel 3 so thatit may contain a valve in its length whose handle 21 is accessible fromthe exterior. In this manner by the valves in the supply and exhaustpipes each unit or section may be individually controlled and both thesupply of steam and the discharge of thewater of condensation regulatedto suit requirements. The

lower end of the stand pipe 12 connects to one end of a series of coils22 constituting the upper supporting coils of the heating pipes in t elower compartment of the oven; the steam thence being conducted downthrough the remaining coils, the water of condensation being carriedofl? by a pipe 23 which connects with the discharge pipe 18 from theupper series of coils. By supplying steam directly to the uppermostcoils of a series in each oven, 1 am enabled to obtain a highertemperature in the upper part of the oven than is secured in the lowerportion thereof, which is desirable in that some small cores may thus bemore advantageously baked in the lower or cooler' portion'of the oven.Of course, as the cores are heated and there is less condensation of thesteam m the pipes, there will eventually be live steam throughout theentire series of pipes, thus bringing the temperature of theoven eventhroughout.

Suspended from the top angles 7 are bars 24 which are connected by meansof cross supports 25 on which the coils of the upper and lower seriesrest. These bars 24: are preferably free to move slightly and constitutethe only supports for the coils "of pipe, thus permitting said coils ofpipe to expand and contract readily as they are alternately heated andcooled.

The openings 4 in the channel 3 above referred to constitute ventilatingopenings into which air may be introduced into the lower portions of theseveral chambers of the oven, the hot humid air escaping through pipes26 which lead respectively to a stack 27. There are as many ovensconnected to a stack as the capacity of the stack will readilyaccommodate, and in order to get the best results in utilizing theventilating openings in the bottom, the doors of the ovens arepreferably close fitting so that the of the oven, flanged uprightsandconnecting} pieces forming a support for top and side walls, coilsofpipe arranged in the baking chamber, and-sus ended supports for-saicoils of pipe which walls.

3. A battery of core ovens, each oven com-. prising walls constituting abaln'n chamber,

coils of steam pipes arranged t erein for supporting the core trays,supports for said coils suspended from the upper portion of the oven,means for se'parately regulating the steam admitted 'into the coils ofeach oven, ventilator openings for letting airinto the bottom portionofeach oven and pipes leading from the upper part of each oven to a commonstack. In testimony whereof I hereunto aifix-my signature in'thepresence of two witnesses,

this 12th day of June, 1913.

' PHILIP B. HARRISON. Witnesses:

-E. T. WALKER,

M. F. HUNTOON.

copies of this patent maybe obtained for five cents each, by addressingthe Commissioner of ratents.

Washington, D. 0.

are independent of said

